GN: Add system_wrappers_unittests, tools and tools_unittests

webrtc/system_wrappers/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
-import("//build/config/android/config.gni")
+if (is_android) {
+  import("//build/config/android/config.gni")
+  import("//build/config/android/rules.gni")
+}
+import("//testing/test.gni")
 import("../build/webrtc.gni")
 
-static_library("system_wrappers") {
+source_set("system_wrappers") {
   sources = [
     "include/aligned_array.h",
     "include/aligned_malloc.h",
     "include/atomic32.h",
     "include/clock.h",
     "include/cpu_features_wrapper.h",
     "include/cpu_info.h",
     "include/critical_section_wrapper.h",
     "include/data_log.h",
     "include/data_log_c.h",
@@ skipping 158 matching lines @@
 if (is_linux) {
   source_set("cpu_features_linux") {
     sources = [
       "source/cpu_features_linux.c",
     ]
 
     configs += [ "..:common_config" ]
     public_configs = [ "..:common_inherited_config" ]
   }
 }
+
+test("system_wrappers_unittests") {
+  testonly = true
+  sources = [
+    "source/aligned_array_unittest.cc",
+    "source/aligned_malloc_unittest.cc",
+    "source/clock_unittest.cc",
+    "source/condition_variable_unittest.cc",
+    "source/critical_section_unittest.cc",
+    "source/data_log_c_helpers_unittest.c",
+    "source/data_log_c_helpers_unittest.h",
+    "source/data_log_helpers_unittest.cc",
+    "source/event_timer_posix_unittest.cc",
+    "source/logging_unittest.cc",
+    "source/metrics_default_unittest.cc",
+    "source/metrics_unittest.cc",
+    "source/ntp_time_unittest.cc",
+    "source/rtp_to_ntp_unittest.cc",
+    "source/stl_util_unittest.cc",
+    "source/stringize_macros_unittest.cc",
+  ]
+  if (rtc_enable_data_logging) {
+    sources += [
+      "source/data_log_unittest.cc",
+      "source/data_log_unittest_disabled.cc",
+    ]
+  }
+
+  configs += [ "..:common_config" ]
+  public_configs = [ "..:common_inherited_config" ]
+
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
+
+  if (is_clang) {
+    # Suppress warnings from Chrome's Clang plugins.
+    # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
+    configs -= [ "//build/config/clang:find_bad_constructs" ]
+  }
+
+  deps = [
+    ":metrics_default",
+    ":system_wrappers",
+    "../test:test_support_main",
+    "//testing/gtest",
+  ]
+
+  if (is_android) {
+    deps += [ "//testing/android/native_test:native_test_support" ]
+  }
+}